02023naa a2200157 a 450000100080000000500110000800800410001910000150006024500760007526000090015152015630016065300300172365300260175365300300177977300560180915221432023-12-11       1983    bl uuuu     u00u1 u    #d1 aTORRES, F.  aRole of woody perennials in animal agroforestry.h[electronic resource]  c1983  aAbstract: Two main roles are identified in the review: the productive one, where woody perennials yield a material output (fuel, fodder, etc.), and the ‘service’ type, with no tangible product (shelter, nutrient recycling, etc.). In their productive role trees and shrubs may supply fodder in browsing systems, or industrial material, wood products and food in forest and plantation grazing systems. Service roles, rarely divorced from productive ones, arise mainly from relationships between woody perennials and the herbaceous vegetation growing in their vicinity. As a fodder source, the relatively low productivity and palatability of high protein content foliage from most woody perennials would indicate a supplementary role, particulary during dry seasons in arid and semiarid zones. In these type of lands pod-bearing trees seem to have a greater potential for improving fodder production in silvopastoral systems. The negative effect of trees on pasture production in forest and plantation grazing is compensated by their contribution to the system through other products. Available data would support the potential of certain species of woody perennials to foster pasture growing underneath, mainly through soil enrichment. Windbreaks can also indirectly benefit pasture growth, by decreasing water loss from the soil. It is postulated that research efforts in animal agroforestry should be focused on woody perennials for browsing systems, particularly on pod-bearing trees having beneficial effects on the herbaceous layer growing underneath.  aAgrosilvopastoral systems  aSistema agroflorestal  aSistema agrosilvopastoril  tAgroforestry Systemsgv. 1, n. 2, p. 131-163, 1983.